TL;DR: The confusion comes from size and name meaning different things. A 12-inch single and an LP are the same physical 12" disc, but an LP ("long play") packs a whole album — usually five or more tracks a side — while a 12-inch single spreads just one or a few tracks across the same space, giving wider grooves, louder cuts and better sound, which is why DJs and dance labels love it. An EP ("extended play") sits in between: more than a single, less than an album, typically three to five tracks, and can be pressed on either a 7", 10" or 12". So judge a record by its track count and stated format, not just its diameter.
Why the names are so confusing
Size and format are two different things, and people mix them up constantly. "12-inch" describes the diameter of the disc. "LP," "EP" and "single" describe how much music is on it and how it is marketed. That is why a 12-inch single and a 12-inch LP can look identical in the rack but be completely different releases. Discogs will list both as 12" — you have to read the track count to know what you are holding.
The LP (album)
LP stands for Long Play. It is a full album: typically five or more tracks per side, around 18–22 minutes a side for best fidelity. To fit all that music, the grooves are packed tightly together, which is a slight trade-off in outright loudness and dynamic range. This is the format for listening front-to-back at home — the classic album experience.
The 12-inch single
Here is the clever part. Take that same 12" disc but put only one or two tracks on each side, and the mastering engineer can cut much wider, more widely-spaced grooves. Wider grooves allow a hotter, louder cut with greater dynamic range and deeper bass — exactly what a club sound system and a DJ mixer want. That is why the 12-inch single became the defining format of dance music: maximum volume, maximum low-end, and often extended or remixed versions built for the floor rather than the radio.
The EP (extended play)
An EP is the middle ground: longer than a single, shorter than an album — usually three to five tracks. Confusingly, EPs come in several sizes (7", 10" or 12"), so the name tells you about length, not diameter. In electronic music the 12" EP is the workhorse release: a producer will drop a four-track 12" EP of club tools, and it is often where the best, deepest material lives.
Why it matters when you are buying
Knowing the format tells you what you are actually getting. If a title is listed as an LP you are buying an album; if it is a 12" single or EP you are buying a smaller, often floor-focused release — frequently with exclusive remixes or dub versions you will not find on the album. For techno and house especially, the 12" single and EP are where the real DJ ammunition lives, which is why they dominate a serious dance collection. You will see this reflected right across our house vinyl selection, where 12" singles and EPs sit alongside full LPs — check the track listing so you know exactly which format you are adding to the cart.
Quick reference
LP: full album, 5+ tracks a side, tighter grooves, made for home listening. 12-inch single: one or two tracks a side, wide loud grooves, made for the club and the DJ. EP: three to five tracks, can be any size, more than a single but less than an album. When in doubt, ignore the diameter and count the tracks.
